Enforced ReplicationServerDomain responsibilities by increasing encapsulation.


ReplicationServer.java:
Added getConnectedRSUrls(), that aggregates code from ReplicationServerDomain.getChangelogs() and from runConnect().
In applyConfigurationChange(), moved code to ReplicationServerDomain for better encapsulation.

ReplicationServerDomain.java:
Renamed checkForDuplicateDS() into isAlreadyConnectedToDS().
Renamed checkForDuplicateRS() into isAlreadyConnectedToRS().
Moved getChangelogs() to ReplicationServer.
Made several methods private to reduce coupling and enforce class responsibilities.
Generalized the use of isRunningStatusAnalyzer() and isRunningMonitoringPublisher() to improved readability.
Inlined updateStatusAnalyzer() and updateMonitoringPublisher().
Moved code from ... to create updateDegradedStatusThreshold() and updateMonitoringPeriod().
In stopReplicationServers(), renamed parameter for increased readability.

DataServerHandler.java:
Inlined createStatusAnalyzer().

ServerHandler.java, ReplicationServerHandler.java:
Inlined createMonitoringPublisher().
In lockDomain(), removed useless else.
Code cleanup.

StatusAnalyzer.java:
Extracted isInterrupted().
Extracted getMessage() to make error messages more conherent.